The supplied batteries are fully charged. The red power LED lit up when I pressed the play button. However, the Play, Rewind, and Fast Forward functions do not work because the spindles are not spinning. The device was probably damaged by the thin packaging. I also wonder if Revain was scammed into accepting the supplied item for resale, but since no one tried to test that the cartridge worked they assumed the item was fine. It is not. I tried several cassettes and my own batteries but it didn't work.
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